<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
  </head>

  <body>
    <script>
      // 用于获取对象自身所有的属性
      var obj = {
        id: 1,
        pname: '小米',
        price: 1999,
        num: 2000
      }
      console.log(obj) // { id: 1, pname: '小米', price: 1999, num: 2000 }
      var arr = Object.keys(obj)
      console.log(arr) // [ 'id', 'pname', 'price', 'num' ]
      arr.forEach(function (value) {
        console.log(value)
      })
    </script>
  </body>
</html>
